如果我们测量热力学量会发现自由焓的变化,等于4千焦，正4千焦。，delta，H，is，4，kiloJoules，，plus，4，kiloJoules。,熵增dS是45焦耳每开尔文。

If we measure the thermodynamics, we discover that dH Delta S is 45 joules per Kelvin.

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然而，通过自由落体测试，研究者可以量化的测量翅果的飞行动力并且用得到的信息数据来控制翅果的自旋和飞行轨迹。

However, through free-fall testing, the researchers could quantitatively measure the samara's flight dynamics and use this information to control the samara's autorotation and flight path.

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本文研究了逆向工程的关键技术之一——自由曲面的三维测量技术。

D measurement of free surface, one of key technology of Reverse Engineering, is described in this paper.

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This one turns out to be the heat capacity, and this one turns out to be something that we measure in the Joule-free expansion.

其实，这就是热容，这是焦耳自由膨胀实验中,我们要测量的物理量。

麻省理工公开课 - 热力学与动力学课程节选